arrow_back
search
close

RANSOM_WALTRIX.HA

September 26, 2017
 Analysis by: Rhena Inocencio
 ALIASES:

Win32/Filecoder.CryptProjectXXX.E trojan (ESET)

 PLATFORM:

Windows

 OVERALL RISK RATING:
 DAMAGE POTENTIAL:
 DISTRIBUTION POTENTIAL:
 REPORTED INFECTION:
 INFORMATION EXPOSURE:

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: Yes

  • In the wild: Yes

  OVERVIEW

Infection Channel:

Downloaded from the Internet


This Trojan arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

  TECHNICAL DETAILS

File Size:

Varies

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

25 May 2016

Payload:

Encrypts files, Displays message/message boxes

Arrival Details

This Trojan arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

This malware arrives via the following means:

  • delivered by exploit kits

Installation

This Trojan drops the following files:

  • %AppDataLocal%\VirtualStore\Z - deleted afterwards; contains installation date of the malware
  • %AppDataLocal%\VirtualStore\{unique ID}.key
  • %AppDataLocal%\VirtualStore\{unique ID}.bmp - wallpaper image
  • %AppDataLocal%\VirtualStore\{unique ID}.html - ransom note
  • {folders containing encrypted files}\!Recovery_{unique ID}.bmp - wallpaper image
  • {folders containing encrypted files}\!Recovery_{unique ID}.html - ransom note
  • {folders containing encrypted files}\!Recovery_{unique ID}.txt - ransom note

    where {unique ID} contains 12 hexadecimal characters

(Note: %AppDataLocal% is the Application Data folder found in Local Settings, where it is usually C:\Documents and Settings\{user name}\Local Settings\Application Data on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Local on Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.)

It adds the following processes:

  • copy of the file that executed this ransomware (such as rundll32.exe or regsvr32.exe) named as:
    • {malware path}\svchost.exe
  • executes svchost.exe {malware}.dll, MS11{number}

Autostart Technique

This Trojan drops the following file(s) in the Windows User Startup folder to enable its automatic execution at every system startup:

  • %User Startup%\{unique ID}.lnk

(Note: %User Startup% is the current user's Startup folder, which is usually C:\Documents and Settings\{user}\Start Menu\Programs\Startup on Windows 2000 and XP, and C:\Documents and Settings\{User name}\Start Menu\Programs\Startup on Windows Vista, 7, and 8.)

Other System Modifications

This Trojan modifies the following file(s):

  • It encrypts files and appends the extension .crypt

It changes the desktop wallpaper by modifying the following registry entries:

HKEY_CURRENT_USER\Control Panel\Desktop
TileWallpaper = "0"

HKEY_CURRENT_USER\Control Panel\Desktop
Wallpaper = "{random}\{unique ID}.bmp"

Other Details

This Trojan displays the following images:

It encrypts files with the following extensions:

  • .3DM
  • .3DS
  • .3G2
  • .3GP
  • .7Z
  • .ACCDB
  • .AES
  • .AI
  • .AIF
  • .APK
  • .APP
  • .ARC
  • .ASC
  • .ASF
  • .ASM
  • .ASP
  • .ASPX
  • .ASX
  • .AVI
  • .BMP
  • .BRD
  • .BZ2
  • .C
  • .CER
  • .CFG
  • .CFM
  • .CGI
  • .CGM
  • .CLASS
  • .CMD
  • .CPP
  • .CRT
  • .CS
  • .CSR
  • .CSS
  • .CSV
  • .CUE
  • .DB
  • .DBF
  • .DCH
  • .DCU
  • .DDS
  • .DIF
  • .DIP
  • .DJV
  • .DJVU
  • .DOC
  • .DOCB
  • .DOCM
  • .DOCX
  • .DOT
  • .DOTM
  • .DOTX
  • .DTD
  • .DWG
  • .DXF
  • .EML
  • .EPS
  • .FDB
  • .FLA
  • .FLV
  • .FRM
  • .GADGET
  • .GBK
  • .GBR
  • .GED
  • .GIF
  • .GPG
  • .GPX
  • .GZ
  • .H
  • .H
  • .HTM
  • .HTML
  • .HWP
  • .IBD
  • .IBOOKS
  • .IFF
  • .INDD
  • .JAR
  • .JAVA
  • .JKS
  • .JPG
  • .JS
  • .JSP
  • .KEY
  • .KML
  • .KMZ
  • .LAY
  • .LAY6
  • .LDF
  • .LUA
  • .M
  • .M3U
  • .M4A
  • .M4V
  • .MAX
  • .MDB
  • .MDF
  • .MFD
  • .MID
  • .MKV
  • .MML
  • .MOV
  • .MP3
  • .MP4
  • .MPA
  • .MPG
  • .MS11
  • .MSI
  • .MYD
  • .MYI
  • .NEF
  • .NOTE
  • .OBJ
  • .ODB
  • .ODG
  • .ODP
  • .ODS
  • .ODT
  • .OTG
  • .OTP
  • .OTS
  • .OTT
  • .P12
  • .PAGES
  • .PAQ
  • .PAS
  • .PCT
  • .PDB
  • .PDF
  • .PEM
  • .PHP
  • .PIF
  • .PL
  • .PLUGIN
  • .PNG
  • .POT
  • .POTM
  • .POTX
  • .PPAM
  • .PPS
  • .PPSM
  • .PPSX
  • .PPT
  • .PPTM
  • .PPTX
  • .PRF
  • .PRIV
  • .PRIVAT
  • .PS
  • .PSD
  • .PSPIMAGE
  • .PY
  • .QCOW2
  • .RA
  • .RAR
  • .RAW
  • .RM
  • .RSS
  • .RTF
  • .SCH
  • .SDF
  • .SH
  • .SITX
  • .SLDX
  • .SLK
  • .SLN
  • .SQL
  • .SQLITE
  • .SQLITE
  • .SRT
  • .STC
  • .STD
  • .STI
  • .STW
  • .SVG
  • .SWF
  • .SXC
  • .SXD
  • .SXI
  • .SXM
  • .SXW
  • .TAR
  • .TBK
  • .TEX
  • .TGA
  • .TGZ
  • .THM
  • .TIF
  • .TIFF
  • .TLB
  • .TMP
  • .TXT
  • .UOP
  • .UOT
  • .VB
  • .VBS
  • .VCF
  • .VCXPRO
  • .VDI
  • .VMDK
  • .VMX
  • .VOB
  • .WAV
  • .WKS
  • .WMA
  • .WMV
  • .WPD
  • .WPS
  • .WSF
  • .XCODEPROJ
  • .XHTML
  • .XLC
  • .XLM
  • .XLR
  • .XLS
  • .XLSB
  • .XLSM
  • .XLSX
  • .XLT
  • .XLTM
  • .XLTX
  • .XLW
  • .XML
  • .YUV
  • .ZIP
  • .ZIPX

  SOLUTION

Minimum Scan Engine:

9.800

FIRST VSAPI PATTERN FILE:

12.548.06

FIRST VSAPI PATTERN DATE:

25 May 2016

VSAPI OPR PATTERN File:

12.549.00

VSAPI OPR PATTERN Date:

26 May 2016

Step 1

Before doing any scans, Windows XP, Windows Vista, and Windows 7 users must disable System Restore to allow full scanning of their computers.

Step 2

Note that not all files, folders, and registry keys and entries are installed on your computer during this malware's/spyware's/grayware's execution. This may be due to incomplete installation or other operating system conditions. If you do not find the same files/folders/registry information, please proceed to the next step.

Step 3

Scan your computer with your Trend Micro product and note files detected as RANSOM_WALTRIX.HA

Step 4

Restart in Safe Mode

[ Learn More ]

Step 5

Search and delete this file

[ Learn More ]
There may be some files that are hidden. Please make sure you check the Search Hidden Files and Folders checkbox in the "More advanced options" option to include all hidden files and folders in the search result.  
  • !Recovery_{unique ID}.bmp
  • !Recovery_{unique ID}.html
  • !Recovery_{unique ID}.txt
  • {unique ID}.key
  • {unique ID}.bmp
  • {unique ID}.html
  • %User Startup%\{unique ID}.lnk

Step 6

Reset your Desktop properties

[ Learn More ]

Step 7

Restart in normal mode and scan your computer with your Trend Micro product for files detected as RANSOM_WALTRIX.HA. If the detected files have already been cleaned, deleted, or quarantined by your Trend Micro product, no further step is required. You may opt to simply delete the quarantined files. Please check this Knowledge Base page for more information.

Step 8

Restore encrypted files from backup.

Step 9

Scan your computer with your Trend Micro product to delete files detected as RANSOM_WALTRIX.HA. If the detected files have already been cleaned, deleted, or quarantined by your Trend Micro product, no further step is required. You may opt to simply delete the quarantined files. Please check this Knowledge Base page for more information.


Did this description help? Tell us how we did.